Building jack



Jan. s, 1929. 1,698,687

v P. BEGHETTI BUILDING JACK y Filed Feb. 28, 1927 Wag., 7,

l I INVENTOR. L 4' 2'la zz l u Pekf ege'v'- BYmeee/J ,641i ATTORNEYS.

Patented `lain. S, i929.

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PETER BEGHETTI, OF SAN FRANGSCO, CALFOHJQA.`

BUILDING JACK.

Application filed February 28, 1927. Serial No. 171,573.

This invention refers to jacks as used in building construction, and especially to jacks used in connection with concrete beam forms or steel beams preparatory to pouring concrete into the form so that the same will be held true until the material has hardened.

The objects of the invention are to provide a ack for the purpose mentioned which will be simple and cheap, as a great many are necessarily used in a single building, also such a jack which may be quickly and easily operated from the floor upon which .it rests, is free from operating screws and parts liable to be rusted or clogged by water and wet conr crete spilled thereover, and which is easily and quickly released.

In the drawings hereto l show the preferred and modified forms of my j ack.

Fig. 1 is a sectional elevation of a part of a concrete building in course of ctinstruction showing several of my jacks supporting a form in which a concrete girder or beam is cast.

Fig. 2 is a broken perspective view of my jack.

Fig. 3 an enlarged view of the lower part of my jack with adjusting means in place, Fig. 4 a vertical section of Fig. 3 taken along the line 44 of Fig. 3 showing a hand lever in `position on the adjusting means.

lig. 5 is a cross section of my jack taken through the supporting post and sliding member, Figs. 6 and 7 show in cross section, two modifications of the post and sliding member, and Fig. 8 shows in perspective a modification in the shape of the upper end of the sliding member.

Briefly described my invention comprises a post, preferably of wood such as a 4X 4 and an angle or channel iron slidably supported thereon or thereagainst so that it may be ext-ended to any degree and locked to support a building element or form when the post is stood on end on the floor below.

In Fig. 1 the walls of a concrete building are indicated at 1 cast in forms 2, while at .3 is a girder form extending from wall towall and supported on several of my jacks 4 spaced along the girder form preferably positioned each at the upper end under one of the usual 2 X 4 braces or ties 5 of the form, while at the lower end they rest upon the oor 6 below.

The jacks comprise a wooden post 4 usually about 4 X 4 or 6 X 6 with one corner notched out at 4 to form a longitudinal sliding seat for an angle iron 7 slidably held in the seat by means of iron straps 8 passing around and firmly secured to the post as indicated.

At the upper end of the angle iron is a cross arm 9 suitably braced at 10 to the vertical angle iron, and this cross arm is preferably provided with holes 11 adapted to receive a nail for steadying the device in place against the under side of the girder form 3 or ties 5.

This vertically slidable angle iron 7 is provided with slots 12 in its webs vstaggered as indicated and adapted to receive aA wedge plate 13 resting on top of the post or 4plate 8 preferably formed of an extension fromthe upper strap 8 bent to lie on top of the post,v Y and which wedge is driven into any convenient slot in either wall of the angle iron to support the jack against the load. The wedge plate 13 is drilled with holes 14 adapted to receive a nail 25 to prevent withdrawal of the wedge.

In order to raise the sliding member 7 against the load recourse is had to a perforated strap of metal 15 hooked at16 to hang over one of the straps 8 and thereby affording a hanging fulcrum for a bar 17 to be passed through a convenient perforation in the strap and engage at its inner end a plate 1S secured diagonally across the lower part of the angle iron 7 and whereby a downward pressure on the bar 17 as indicated` by the arrow will force the angle iron 7 upward with a power depending on the force used and the length of the lever bar 17 as well as the angular hanging of strap 15 and consequent spacing o-f the fulcrum strap from the plate 18.

Fig. 5 shows the angle iron 7 slidably arranged in the notch 4 in the post 4. Fig. 6 shows the use of an unnotched post 19 and angle iron 2O inverted over one corner and slidably retained by straps 21, while Fig. 7 shows the use of a channel iron 22 for the sliding member mounted between two posts 23 spaced by the strap 24. Fig. 8 shows the form of the upper end of t-he angle iron when no cross bar 9 is used, the angle iron being provided with an extension 7 perforated for nailing to the overhead load.

In operation, usually a dozen or more of my jacks are spaced along under a girder form and after raising by the lever 17, the wedge 13 is gently driven in or placed by hand, and a nail inserted to prevent with-y drawal. l

To release the jacks, it is merely necessaryl to pull out the nail and knock out the Wedge With a hammer.

The jack being in two sections usually of Vfrom 6 to 9 feet in length provides through the staggered slots a long range of adjustment to suit most building operations, while the hanging fulerum plate provides. a means of operating the j aok at a convenient position to a Workman standing on the floor.

I claim:

l. A jack comprising two elongated members mounted for longitudinal sliding one upon the other, means hanging from its upper end on one member forming below its point oir suspension a fulcrum for a lever, and means on theY other member adapted to receive the end of the lever whereby' the members may be longitudinally forced* apart and means for locking said members in any point of sliding adjustment.

2. A jack comprising a post, an angle iron slidablyarranged thereon :1nd provided with a plurality of longitudinally extending slots arranged in staggered relation along its web, and a wedge adapted to enter any of the slots for support of the angle iron against the upper end of the post.

3. A jack comprising a post, a member arranged to slide longitudinally thereagainst, and a plate swingingly suspended at its upper end from said post and provided with a ulcrum sup-port adapted to receive below its point of suspension a lever for sliding said member.

4. A jack comprising a post7 a member arranged to slide longitudinally thereagainst, and a ulcrum plate suspended at its upper end from said post adapted to receive below its point of suspension a lever for sliding said member and wedge means for locking said member of various positions in sliding. y

5. A jack comprising a post notched longitudinally at one corner, an angle iron seated with its webs in said notch, straps secured to the post slidably retaining the angle iron in said notch and means for sliding and locking said angle iron to various positions along said post.

PETER BEGHETTI. 

